详细信息    查看全文

• 作者：Jungkyu Park ; Seung Jae Lee ; Young Jin Kim
• 刊名：Crystal Growth & Design
• 出版年：2013
• 出版时间：December 4, 2013
• 年：2013
• 卷：13
• 期：12
• 页码：5204-5210
• 全文大小：437K
• 年卷期：v.13,no.12(December 4, 2013)
• ISSN：1528-7505

文摘

Sr_{2鈥?i>y鈥?i>z}Ca_zSi(O_1鈥?i>xN_x)₄:yEu²⁺ (SCSON:Eu²⁺) solid solutions were prepared by substituting N^3-, Eu²⁺, and Ca²⁺ ions into Sr₂SiO₄ (SSO). These ions contributed differently to the evolution of luminescence of SCSON:Eu²⁺. SSON:Eu²⁺ (z = 0) has two activation centers: Eu(I) and Eu(II). The nitridation effects led to a dramatic change in the crystal field surrounding the Eu(II) site but rarely affected the Eu(I) site. Accordingly, SSON:Eu²⁺ exhibited broad excitation spectra from ultraviolet to visible wavelengths. In comparison with the Eu(II) green emissions of SSO:Eu²⁺, the dominant peak wavelengths (DPWs) of the Eu(II) emissions were at red emission regions (605鈥?30 nm), depending on the amount of Eu²⁺ ions. The Ca²⁺ ions of SCSON:Eu²⁺ preferentially changed the emission wavelength assigned to Eu(I) and affected the Eu(II) emission intensity. In addition to the spectral properties, the chromaticity coordinates and a low thermal quenching behavior of SCSON:Eu²⁺ powders demonstrated that they can be a novel red phosphors for use in white light emitting diodes.